Manufacture of pipes
a technology of pipes and manufacturing methods, applied in the direction of pressure inorganic powder coating, etc., can solve problems such as incompatibility problems that may need to be considered, and achieve the effects of enhancing cost-effectiveness, less nickel density, and easing any incompatibility problems
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example 1
[0040]The method of the present invention may be conducted on the specially designed in situ rolling test rig and lathe illustrated in the accompanying drawing (FIG. 1). In particular, titanium pipes up to 125 mm in diameter (internal) and up to 450 mm in length may be manufactured on the test rig (with no limitations on the diameter, wall thickness and / or length of the pipes produced).
[0041]The (laboratory) facility of FIG. 1 is designed so that the rolling pressure, applied by the pressure roller head 1, may be maintained during cold spraying and the traverse speeds of both the pressure roller slide 2, driven by the slide drive motor 3, and the cold spraying nozzle (not shown) may be synchronized to move along the pipe as it is being formed. The cold spraying nozzle would typically be positioned directly opposite the mandrel. Multiple nozzles may be used in tandem for cold spraying mandrels of considerable length, wall thickness and / or diameter. The use of multiple nozzles may als...
example 2
[0056]Titanium / mild steel duplex pipes have been manufactured for transporting corrosive liquids. A stainless steel mandrel (external diameter, 50 mm; length, 300 mm) was cold sprayed with a 5 mm thick layer of commercially pure titanium. An additional 5 mm thick mild steel layer was deposited on the titanium layer to produce a duplex pipe of 10 mm thickness. The stainless steel mandrel was removed by utilizing the difference between the thermal expansion coefficient of titanium and the stainless steel.
[0057]Typically, the cold spraying machine parameters for producing the duplex pipe are as follows:
[0058]Equipment: CGT Kinetic 4000
[0059]MOC super sonic nozzle
[0060]Mandrel material: Stainless steel
[0061]Mandrel speed: up to 600 RPM
[0062]Stand-off: 30 mm
[0063]Spray material: Commercially pure Titanium and Mild Steel
[0064]Particle diameter: 10-30 microns for Titanium and Mild Steel
[0065]Gas pressure for titanium 38 bar and 35 bar for Mild Steel
[0066]Gas: Nitrogen 99.999% pure for both...
example 3
[0070]Seamless titanium and titanium alloy pipes with complex internal shapes have been manufactured using cold spraying. An aluminum alloy mandrel was machined on the external surface to produce a spline shaped mandrel that in turn increased the internal surface area of the cold sprayed titanium pipe. The spline contained ten gear shaped teeth around the circumference and each tooth measured 3 mm wide by 3 mm deep. Alternatively the spline shape is not limited to the example provided and the spline tooth depth and width can be varied according to the amount of heat transfer required. The aluminum spline was placed in a lathe machine for the purpose of rotating the mandrel at the required speed. Titanium or titanium alloy was cold sprayed on the surface of the mandrel to build-up the wall thickness of the heat exchanger pipe to 6 mm thick. After cold spraying, the mandrel was removed by dissolving in a sodium hydroxide solution to reveal the titanium heat exchanger pipe. The titaniu...
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Abstract
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